Update runners to ubuntu-24.04 from deprecated ubuntu-20.04 label

Closes #60412

GitOrigin-RevId: 90f39d7
Change-Id: Icb9462884a81041e7ea726863f20378f4939fb38
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/418202
Reviewed-by: Alexander Thomas <[email protected]>

Author: google-admin

.github/workflows/third-party-deps-scan.yml

@@ -14,7 +14,7 @@ permissions: read-all
 jobs:
   extract-deps:
     name: Extract Dependencies
-    runs-on: ubuntu-20.04
+    runs-on: 'ubuntu-24.04'
     if: ${{ (github.repository == 'dart-lang/sdk' && github.event_name == 'push') || github.event.label.name == 'vulnerability scan' }}
     permissions:
       # Needed to upload the SARIF results to code-scanning dashboard.